Subject: Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call

From: "Dmitry V. Levin" <[email-masked]>
Date: Fri, 7 Dec 2018 21:42:46 +0300

On Fri, Dec 07, 2018 at 05:34:10PM +0100, Oleg Nesterov wrote:
> On 12/07, Dmitry V. Levin wrote:
> > On Fri, Dec 07, 2018 at 10:12:49PM +1100, Michael Ellerman wrote:
> >
> > > > Sorry, this patch does not work, please ignore it.
> > >
> > > Hmm OK. Why exactly?
> >
> > Unfortunately, I have no idea why it doesn't work.
> > All I can say is it breaks strace because the kernel no longer sends
> > syscall entry stops.
> 
> May be because TIF_SYSCALL_EMU/etc is a bit number, not a mask? IOW, rather
> than
> 
> 	whatever & TIF_XXX
> 
> you should do
> 
> 	whatever & _TIF_XXX
> 
> intstead?

Thanks Oleg, this was exactly the reason why it didn't work.
That kind of things happens when you let userspace people hack you kernel. :)

-- 
ldv